This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Acids – Quiz 20 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 20 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Write the formula of the following compound.Hydrochloric acid A) HCl. B) Hclo $ _ {2} $. C) HCLO $ _ {3} $. D) None of the above. Show Answer Correct Answer: A) HCl. 2. Sodium phosphate (Na$_{3}$PO$_{4}$) is a A) Weak Acid. B) Weak Base. C) Strong Acid. D) Strong base. Show Answer Correct Answer: B) Weak Base. 3. Soluble Bases are called A) Alkali. B) Natural. C) Synthetic. D) Organic. Show Answer Correct Answer: A) Alkali. 4. What is an Arrhenius base? A) A substance that produces H+ ion in water. B) A substance that produces OH-ion in water. C) A substance that produces OH+ ion in water. D) A substance that produces H-ion in water. Show Answer Correct Answer: B) A substance that produces OH-ion in water. 5. How many atoms are there in CH$_{4}$? A) 6. B) 5. C) 4. D) 1. Show Answer Correct Answer: B) 5. 6. What is the name of the acid with the formula H$_{2}$SO$_{4}$? A) Sulfurous Acid. B) Sulfuric Acid. C) Hydrogen sulfuric Acid. D) Sulfate Acid. Show Answer Correct Answer: B) Sulfuric Acid. 7. These acids are mineral acid except? A) Hydrochloric acid. B) Nitric acid. C) Ethanoic acid. D) Nitric acid. Show Answer Correct Answer: C) Ethanoic acid. 8. The correct formula for carbonic acid is A) HCl. B) H $ _ {2} $ co $ _ {2} $. C) HCO$_{3}$. D) H $ _ {2} $ co $ _ {3} $. Show Answer Correct Answer: D) H $ _ {2} $ co $ _ {3} $. 9. What is the formula for Hydrosulfuric Acid? A) H$_{2}$(SO$_{3}$). B) H$_{2}$S. C) H$_{2}$(SO$_{2}$). D) H$_{2}$(SO$_{4}$). Show Answer Correct Answer: B) H$_{2}$S. 10. What is the [H$^{+}$] if the pH is 4.0? A) 1.0 x 10$^{-10}$ M. B) 1.0 x 10$^{-4 }$M. C) 1.0 x 10$^{-14}$ M. D) 1.0 x 10$^{-7}$ M. Show Answer Correct Answer: B) 1.0 x 10$^{-4 }$M. 11. Weak acids have a lower pH than stronger acids? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 12. What is a substance that produces Hydronium ions when it dissolves in Water? A) Acid. B) Base. C) Ionization. D) Hydronium Ion. Show Answer Correct Answer: A) Acid. 13. Lime water turns A) Blue litmus red. B) Red litmus blue. C) No change. D) None of the above. Show Answer Correct Answer: B) Red litmus blue. 14. In aqueous solution, H+ ions exist as A) H$_{3}$0$^{+}$. B) H$_{9}$O$_{4}$$^{+}$. C) Neither of these. D) Either H$_{3}$0$^{+ }$or H$_{9}$O$_{4}$$^{+}$. Show Answer Correct Answer: A) H$_{3}$0$^{+}$. 15. A turmeric stain on a white shirt turns to red when washed with soap. It is because ..... A) Soap solution is acidic in nature. B) Soap solution is basic in nature. C) Soap solution is both acidic and basic in nature. D) Soap solution is neutral in nature. Show Answer Correct Answer: B) Soap solution is basic in nature. 16. Which one of the following is base? A) Soap. B) Lemon juice. C) Vinegar. D) Sugar syrup. Show Answer Correct Answer: A) Soap. 17. The "Polyatomic Ion" chart is needed to name: A) Binary acids. B) Oxyacids. C) Jack acids. D) All acids. Show Answer Correct Answer: B) Oxyacids. 18. When the soil is too Basic, what do you add to neutralise the effect? A) Basic Quicklime. B) Phenolphthalein. C) Organic Matter. D) Nitric Acid. Show Answer Correct Answer: C) Organic Matter. 19. Which base is used to cure acidity problems? A) Magnesium hydroxide. B) Ammonium hydroxide. C) Potassium hydroxide. D) Sodium hydroxide. Show Answer Correct Answer: A) Magnesium hydroxide. 20. ..... is a compound that contains one or more hydrogen atoms and produces hydrogen ions when dissolved in water. A) An acid. B) A base. C) A salt. D) None of the above. Show Answer Correct Answer: A) An acid. 21. Which substance is an acid? A) Water. B) Bleach. C) Orange juice. D) Washing powder. Show Answer Correct Answer: C) Orange juice. 22. Which of the following statements is true concerning acids and bases? A) Acids and bases don't react with each other. B) Acids mixed with bases neutralize each other. C) Acids mixed with bases make stronger bases. D) Acids mixed with bases make stronger acids. Show Answer Correct Answer: B) Acids mixed with bases neutralize each other. 23. What is the only substance with a neutral pH of 7? A) Milk. B) Orange Juice. C) Water. D) Blood. Show Answer Correct Answer: C) Water. 24. A drop of solution 'X' is placed on a strip of pH paper. A deep red colour is produced. The solution 'X' is A) NaOH. B) HCl. C) H$_{2}$O. D) On $ _ {2} $ co $ _ {3} $. Show Answer Correct Answer: B) HCl. 25. Lactic acid present in A) Lemon. B) T e a. C) Apple. D) Milk. Show Answer Correct Answer: D) Milk. ← PreviousNext →Related QuizzesClass 7 Science Chapter 4 Acids Quiz 1Class 7 Science Chapter 4 Acids Quiz 2Class 7 Science Chapter 4 Acids Quiz 3Class 7 Science Chapter 4 Acids Quiz 4Class 7 Science Chapter 4 Acids Quiz 5Class 7 Science Chapter 4 Acids Quiz 6Class 7 Science Chapter 4 Acids Quiz 7Class 7 Science Chapter 4 Acids Quiz 8Class 7 Science Chapter 4 Acids Quiz 9Class 7 Science Chapter 4 Acids Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books